1
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Valiulina LI, Cherepanov VN, Khoroshkin K. Insight into magnetically induced ring currents and photophysics of six-porphyrin nanorings. Phys Chem Chem Phys 2024; 26:22337-22345. [PMID: 39157944 DOI: 10.1039/d4cp02547d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/20/2024]
Abstract
The series of nanorings based on Zn-porphyrins and tetraoxa-isophlorins in different oxidation states (Q = 0, 2+, 4+, 6+) have been studied studied computationally at density functional theory level (DFT) using BHandHLYP functional combined with def2-SVP basis sets. Magnetically induced ring currents of nanorings have been calculated using the GIMIC method and the Ampère-Maxwell integration scheme. Ring current calculations show that neutral nanorings sustain equal diatropic and paratropic currents of 8 nA T-1, resulting in zero net ring current strengths. The charged nanorings sustain strong ring currents with tropicity depending on the oxidation state Q. Among the considered nanorings, the nanoring composed of 6 isophlorins c-Iso66+ is the most aromatic with a ring current of IGIMIC = 81.6 nA T-1. The structure c-P62+ with a ring current of IGIMIC = 54.9 nA T-1 can be considered as the most aromatic among the synthesized porphyrin nanorings. Spin-orbit coupling matrix elements, oscillator strengths, and excitation energies calculated at the CAM-B3LYP/def2-SVP level of theory were used to estimate rate constants for radiative and nonradiative processes. The algorithm based on X-H approximation were used to calculate the internal conversion rates (kIC). The main channel for the deactivation of the excitation energy in the studied nanorings is the process of internal conversion. The deactivation of excited energy occurs due to the vibrations of certain groups of C-H bonds in the nanorings. The nanoring c-Iso6 has magnetically allowed low-lying transitions that contributes significantly to the paratropic ring current, resulting in strong local antiaromaticity in the tetraoxa-isophlorin units.
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Affiliation(s)
- Lenara I Valiulina
- Department of Optics and Spectroscopy, Tomsk State University, Tomsk, 634050, Russia.
| | - Victor N Cherepanov
- Department of Optics and Spectroscopy, Tomsk State University, Tomsk, 634050, Russia.
| | - Kirill Khoroshkin
- Department of Optics and Spectroscopy, Tomsk State University, Tomsk, 634050, Russia.
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2
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Valiev RR, Kurten T, Valiulina LI, Ketkov SY, Cherepanov VN, Dimitrova M, Sundholm D. Magnetically induced ring currents in metallocenothiaporphyrins. Phys Chem Chem Phys 2022; 24:1666-1674. [PMID: 34981802 DOI: 10.1039/d1cp04779e] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The magnetically induced current-density susceptibility tensor (CDT) of the lowest singlet and triplet states of the metallocenothiaporphyrins, where the metal is V, Cr, Mn, Fe, Co, Ni, Mo, Tc, Ru, or Rh, have been studied with the gauge-including magnetically induced currents (GIMIC) method. The compounds containing V, Mn, Co, Tc or Rh were studied as cations because the neutral molecules have an odd number of electrons. The calculations show that the aromatic nature of most of the studied molecules follows the Hückel and Baird rules of aromaticity. CDT calculations on the high-spin states of the neutral metallocenothiaporphyrins with V, Mn, Co, Tc or Rh also shows that these molecules follow a unified extended Hückel and Baird aromaticity orbital-count rule stating that molecules with an odd number of occupied conjugated valence orbitals are aromatic, whereas molecules with an even number of occupied conjugated orbitals are antiaromatic.
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Affiliation(s)
- Rashid R Valiev
- Department of Optics and Spectroscopy, Tomsk State University, Tomsk, 634050, Russia.,Department of Chemistry, Faculty of Science, University of Helsinki, FIN-00014, Helsinki, Finland.
| | - Theo Kurten
- Department of Chemistry, Faculty of Science, University of Helsinki, FIN-00014, Helsinki, Finland.
| | - Lenara I Valiulina
- Department of Optics and Spectroscopy, Tomsk State University, Tomsk, 634050, Russia
| | - Sergey Yu Ketkov
- Laboratory of Structures of Organometallic and Coordination Compounds, G. A. Razuvaev Institute of Organometallic Chemistry RAS, 49 Tropinin St., Nizhny Novgorod 603950, Russia
| | - Viktor N Cherepanov
- Department of Optics and Spectroscopy, Tomsk State University, Tomsk, 634050, Russia
| | - Maria Dimitrova
- Department of Chemistry, Faculty of Science, University of Helsinki, FIN-00014, Helsinki, Finland.
| | - Dage Sundholm
- Department of Chemistry, Faculty of Science, University of Helsinki, FIN-00014, Helsinki, Finland.
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3
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Kopp SM, Gotfredsen H, Deng JR, Claridge TDW, Anderson HL. Global Aromaticity in a Partially Fused 8-Porphyrin Nanoring. J Am Chem Soc 2020; 142:19393-19401. [PMID: 33125228 DOI: 10.1021/jacs.0c09973] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Template-directed synthesis has been used to prepare a fully π-conjugated cyclic porphyrin octamer, composed of both β,meso,β-edge-fused porphyrin tape units and butadiyne-linked porphyrins. The UV-vis-NIR spectra of this partially fused nanoring show that π-conjugation extends around the whole macrocycle, and that it has a smaller HOMO-LUMO gap than its all-butadiyne-linked analogue, as predicted by TD-DFT calculations. The 1H NMR shifts of the bound templates confirm the disrupted aromaticity of the edge-fused porphyrins in the neutral nanoring. NMR oxidation titrations reveal the presence of a global paratropic ring current in its 4+ and 8+ oxidation states and of a global diatropic ring current in the 6+ state of the partially fused ring. The paratropic ring current in the 4+ oxidation state is about four times stronger than that in the all-butadiyne-linked cyclic octamer complex, whereas the diatropic current in the 6+ state is about 40% weaker. Two isomeric K-shaped tetrapyridyl templates with trifluoromethyl substituents at different positions were used to probe the distribution of the ring current in the 4+, 6+, and 8+ oxidation states by 19F NMR, demonstrating that the ring currents are global and homogeneous.
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Affiliation(s)
- Sebastian M Kopp
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford OX1 3TA, United Kingdom
| | - Henrik Gotfredsen
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford OX1 3TA, United Kingdom
| | - Jie-Ren Deng
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford OX1 3TA, United Kingdom
| | - Tim D W Claridge
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford OX1 3TA, United Kingdom
| | - Harry L Anderson
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford OX1 3TA, United Kingdom
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4
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Abstract
Nickel norcorrole dimer 3 linked with a phenylene bridge was prepared by a nickel-mediated homolytic cross-coupling of meso-phenylene bisdipyrrin nickel(II) dimer 2b. The structures of 2b and 3 were elucidated by X-ray diffraction analysis. Each nickel norcorrole fraction of the nickel norcorrole dimer 3 exposed a bowl-like structure, which conserved anti-conformation. Structural distinctions between the monomeric and dimeric nickel norcorroles were established by vibrational spectroscopic analysis and assessed with density functional theory calculations. Enhanced flexibility of the norcorrole planes in solution states of monomeric nickel norcorrole was compromised to that of bowl-shaped norcorroles in the solid states of nickel norcorrole dimer 3, where C[Formula: see text] was the formulated conformation. The deformation of the planarity derived from the objection of laser pulses effectuated vibration shifts of specific Raman-active motions toward a higher-frequency region, as associating with a paratropic nature of the [Formula: see text]-electron delocalization circuit of norcorrole. Computational simulation exposed a reliable drift of the Raman frequencies.
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Affiliation(s)
- Ji-Young Shin
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
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5
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Tanaka Y, Murayama T, Muranaka A, Imai E, Uchiyama M. Ring-Opened Hemiporphyrazines: Helical Molecules Exhibiting Circularly Polarized Luminescence. Chemistry 2020; 26:1768-1771. [PMID: 31868264 DOI: 10.1002/chem.201905246] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Indexed: 11/11/2022]
Abstract
We designed and synthesized a new type of small helical molecule exhibiting intense circularly polarized luminescence (CPL) (12H ) by modifying a 20π-electron hemiporphyrazine with a large transition magnetic dipole moment. The hemiporphyrazine ring was opened and one additional pyridine unit was introduced, resulting in an overlap of two pyridine rings. X-ray structure analysis confirmed that 12H and its zinc complex (1Zn ) adopt a helical geometry. A racemic mixture of 1Zn was resolved into two enantiomers ((P)- and (M)-1Zn ), which exhibited CPL with a high luminescence dissymmetry factor (glum ) value of ±2.1×10-2 . The origin of the large glum value was rationalized by means of DFT calculations. Helical structures could be formed in a diastereoselective manner by covalently attaching chiral units to the skeleton (1'2H and 1'Zn ). 1Zn was found to possess chiral recognition ability for amines.
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Affiliation(s)
- Yusuke Tanaka
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Tomotaka Murayama
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Atsuya Muranaka
- Cluster of Pioneering Research (CPR), Advanced Elements Chemistry Laboratory, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan
| | - Eiyu Imai
- Cluster of Pioneering Research (CPR), Advanced Elements Chemistry Laboratory, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan
| | - Masanobu Uchiyama
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.,Cluster of Pioneering Research (CPR), Advanced Elements Chemistry Laboratory, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan.,Research Initiative for Supra-Materials (RISM), Shinshu University, Ueda, 386-8567, Japan
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6
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Valiev RR, Valiulina LI, Fliegl H, Sundholm D. The effect of anion complexation on the aromatic properties of aromatic and antiaromatic porphyrinoids. NEW J CHEM 2020. [DOI: 10.1039/d0nj04470a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The effect of anion complexation on magnetically induced current densities and excitation energies of antiaromatic molecular rings has been investigated by calculations on expanded antiaromatic porphyrinoids including orangarin, rosarin, amethyrin and on a theoretically predicted strongly antiaromatic hydrocarbon ring.
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Affiliation(s)
- Rashid R. Valiev
- Department of Chemistry
- Faculty of Science
- University of Helsinki
- Helsinki FIN-00014
- Finland
| | | | - Heike Fliegl
- Karlsruhe Institute of Technology (KIT)
- Institute of Nanotechnology
- Eggenstein-Leopoldshafen
- Germany
| | - Dage Sundholm
- Department of Chemistry
- Faculty of Science
- University of Helsinki
- Helsinki FIN-00014
- Finland
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7
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Valiev R. Competition between the nonadiabatic electronic state-mixing and the Herzberg-Teller vibronic effects in fluorescence process of tetraoxa[8]circulene. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2019.136914] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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8
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Karaush-Karmazin NN, Kuklin AV, Baryshnikov GV, Begunovich LV, Ågren H, Minaev BF. Structure, stability and electronic properties of one-dimensional tetrathia- and tetraselena[8]circulene-based materials: a comparative DFT study. NEW J CHEM 2020. [DOI: 10.1039/d0nj00676a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Computations reveal how the electronic and optical properties can be controlled in nanostructures.
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Affiliation(s)
| | - Artem V. Kuklin
- Department of Science and Innovations
- Siberian Federal University
- Krasnoyarsk
- Russian Federation
- Division of Theoretical Chemistry and Biology
| | - Gleb V. Baryshnikov
- Department of Chemistry and Nanomaterials Science
- Bohdan Khmelnytsky National University
- Cherkasy
- Ukraine
- Division of Theoretical Chemistry and Biology
| | - Lyudmila V. Begunovich
- Department of Science and Innovations
- Siberian Federal University
- Krasnoyarsk
- Russian Federation
| | - Hans Ågren
- Division of Theoretical Chemistry and Biology
- School of Engineering Sciences in Chemistry
- Biotechnology and Health
- KTH Royal Institute of Technology
- 10691 Stockholm
| | - Boris F. Minaev
- Department of Chemistry and Nanomaterials Science
- Bohdan Khmelnytsky National University
- Cherkasy
- Ukraine
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9
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Samala S, Dutta R, He Q, Park Y, Chandra B, Lynch VM, Jung YM, Sessler JL, Lee CH. A robust bis-rhodium(i) complex of π-extended planar, anti-aromatic hexaphyrin[1.0.1.0.1.0]. Chem Commun (Camb) 2019; 56:758-761. [PMID: 31845684 DOI: 10.1039/c9cc09221h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
β,β'-Phenylene bridged hexaphyrin[1.0.1.0.1.0] (naphthorosarin), an expanded porphyrin possessing C3v-symmetry, has been shown to possess unique electronic features. We now report a bimetallic Rh(i)-complex of naphthorosarin retaining 24 π-antiaromatic characteristics. The two Rh(i) cations reside on opposite sides of the macrocyclic π-system and are separated at a distance consistent with a possible Rh(i)-Rh(i) metallic bond interaction.
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Affiliation(s)
- Srinivas Samala
- Department of Chemistry, Kangwon National University, Chuncheon 24341, Korea.
| | - Ranjan Dutta
- Department of Chemistry, Kangwon National University, Chuncheon 24341, Korea.
| | - Qing He
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Yeonju Park
- Department of Chemistry, Kangwon National University, Chuncheon 24341, Korea.
| | - Brijesh Chandra
- Department of Chemistry, Kangwon National University, Chuncheon 24341, Korea.
| | - Vincent M Lynch
- Department of Chemistry, The University of Texas, Austin, TX 78712-1224, USA.
| | - Young Mee Jung
- Department of Chemistry, Kangwon National University, Chuncheon 24341, Korea.
| | - Jonathan L Sessler
- Department of Chemistry, The University of Texas, Austin, TX 78712-1224, USA.
| | - Chang-Hee Lee
- Department of Chemistry, Kangwon National University, Chuncheon 24341, Korea.
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10
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Baryshnikov GV, Valiev RR, Li Q, Li C, Xie Y, Ågren H. Computational study of aromaticity, 1H NMR spectra and intermolecular interactions of twisted thia-norhexaphyrin and its multiply annulated polypyrrolic derivatives. Phys Chem Chem Phys 2019; 21:25334-25343. [PMID: 31701970 DOI: 10.1039/c9cp04819g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The recently synthesized twisted thia-norhexaphyrin and its multiply annulated polypyrrolic derivatives have been studied computationally. Gauge-including magnetically induced current calculations predict a global nonaromatic character of the initial thia-norhexaphyrin due to the highly-twisted conformation of the macrocycle. Upon the oxidation of the thia-norhexaphyrin four multiply annulated polypyrrolic aromatic macrocycles are formed for which the global aromatic character is confirmed in agreement with experimentally measured 1H NMR spectra. The calculation of the proton chemical shifts for the studied compounds by direct comparison with the tetramethylsilane standard leads to a significant mean absolute error. At the same time a linear regression procedure for the two selected groups of protons (CH and NH protons) provides much better values of calculated chemical shifts and tight correlation with experiment. The separate consideration of NH protons is motivated by the numerous intermolecular hydrogen bonds in which the protons are involved, which induce considerable upfield shifts, leading to a significant underestimation of the corresponding chemical shifts. Such a selected correlation can be used for accurate estimation of proton chemical shifts of the related porphyrinoids. Bader's theory of Atoms in Molecules has been applied for the studied twisted thia-norhexaphyrin and its multiply annulated polypyrrolic derivatives to characterize intramolecular H-bonds and other non-covalent interactions.
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Affiliation(s)
- Gleb V Baryshnikov
- Division of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, 10691, Stockholm, Sweden. and Department of Chemistry and Nanomaterials Science, Bohdan Khmelnytsky National University, 18031, Cherkasy, Ukraine
| | - Rashid R Valiev
- Research School of Chemistry & Applied Biomedical Sciences, National Research Tomsk Polytechnic University, Lenin Avenue 30, Tomsk 634050, Russia and Department of Chemistry, University of Helsinki, FIN-00014, Helsinki, Finland
| | - Qizhao Li
- Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, School of Chemistry and Molecular Engineering, East China University of Science & Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Chengjie Li
- Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, School of Chemistry and Molecular Engineering, East China University of Science & Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Yongshu Xie
- Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, School of Chemistry and Molecular Engineering, East China University of Science & Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Hans Ågren
- Division of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, 10691, Stockholm, Sweden. and College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, P. R. China
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11
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Benkyi I, Sundholm D. Aromatic Pathways in Porphycene Derivatives Based on Current-Density Calculations. J Phys Chem A 2019; 123:284-292. [PMID: 30561203 DOI: 10.1021/acs.jpca.8b10818] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Magnetically induced current densities have been calculated for porphycenes at the density functional theory level using gauge-including atomic orbitals to ensure gauge-origin independence and a fast basis-set convergence of the current densities. The current densities have been analyzed by using the gauge-including magnetically induced current (GIMIC) method. The porphycenes are aromatic, sustaining strong diatropic ring currents. The ring-current pathways have been determined by integrating the strength of the current density passing selected bonds. The calculations show that the ring current of the porphycenes splits into an outer and inner branch at the pyrrolic rings implying that the ring current involves all 26 π electrons of the porphycenes, which is similar to the ring current of porphyrins. The pyrrolic rings of the aromatic porphycenes do not sustain any significant local ring currents. Dihydroporphycene with four inner hydrogens is antiaromatic with weakly aromatic pyrrolic rings. The annelated benzoic rings in benzoporphycene sustain local paratropic ring currents, whereas the global ring current of dibenzoporphycene splits into an outer and inner branch at the benzoic rings. Comparison of calculated 1H NMR shieldings with ring-current strengths shows that interactions between the inner hydrogen and the neighbor nitrogen is more significant for differences in the 1H NMR shieldings than variations in global ring-current strengths. Calculated excitation energies show that the antiaromatic dihydroporphycene has a smaller optical gap than the aromatic porphycene, even though its HOMO-LUMO gap is larger.
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Affiliation(s)
- Isaac Benkyi
- University of Helsinki , Department of Chemistry , P.O. Box 55 ( A.I. Virtanens plats 1 ), FIN-00014 Helsinki , Finland
| | - Dage Sundholm
- University of Helsinki , Department of Chemistry , P.O. Box 55 ( A.I. Virtanens plats 1 ), FIN-00014 Helsinki , Finland
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12
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Valiev RR, Baryshnikov GV, Sundholm D. Relations between the aromaticity and magnetic dipole transitions in the electronic spectra of hetero[8]circulenes. Phys Chem Chem Phys 2018; 20:30239-30246. [PMID: 30474088 DOI: 10.1039/c8cp05694c] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Magnetically induced current densities have been calculated at the second-order Møller-Plesset perturbation theory (MP2) level for seven hetero[8]circulenes and their dicationic and dianionic forms. Calculations of the magnetic dipole transition moments have also been carried out at the algebraic diagrammatic construction (ADC(2)) and the second-order approximate coupled-cluster (CC2) levels. The calculations show that the degree of aromaticity and the size of the magnetic dipole transition moment of the lowest magnetic-dipole allowed excited state are related. We show that neutral hetero[8]circulenes are weakly antiaromatic when the first excited state with a large magnetic dipole transition moment of 10-16 a.u. lies at high energies (∼2.8-3.5 eV). For the dications, this transition often lies at much lower energies. Hetero[8]circulene dications with large magnetic dipole transition moments are strongly antiaromatic. The lowest excited states of the hetero[8]circulene dianions have very small magnetic dipole transition moments implying that they are aromatic.
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Affiliation(s)
- R R Valiev
- Tomsk State University, 36 Lenin Avenue, 634050, Tomsk, Russian Federation.
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13
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Foroutan-Nejad C, Ghosh A. Magnetic Diversity in Heteroisocorroles: Aromatic Pathways in 10-Heteroatom-Substituted Isocorroles. ACS OMEGA 2018; 3:15865-15869. [PMID: 31458232 PMCID: PMC6643806 DOI: 10.1021/acsomega.8b02626] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 11/08/2018] [Indexed: 06/10/2023]
Abstract
A recent study on magnetically induced currents in 10-isocorrole derivatives indicated that both the free-base and metal-complexed forms of the unsubstituted macrocycle are homoaromatic. Furthermore, depending on the substituents at the 10-position, the aromatic character was found to swing between substantially homoaromatic to substantially antihomoaromatic. Heteroisocorroles, in which the saturated 10-position has been replaced by a heteroatom-containing group X, are predicted to exhibit even more dramatic variations in aromatic character, ranging from strongly aromatic (X = O, NH, PH, and S) to strongly antiaromatic (X = BH and CO). Interestingly, the experimentally studied X = SiMe2 case does not appear to sustain a significant global ring current.
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Affiliation(s)
- Cina Foroutan-Nejad
- CEITEC - Central
European Institute of Technology, Masaryk
University, Kamenice 5, CZ−62500 Brno, Czech Republic
| | - Abhik Ghosh
- Department
of Chemistry and Center for Theoretical and Computational Chemistry, UiT − The Arctic University of Norway, 9037 Tromsø, Norway
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14
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Valiev RR, Benkyi I, Konyshev YV, Fliegl H, Sundholm D. Computational Studies of Aromatic and Photophysical Properties of Expanded Porphyrins. J Phys Chem A 2018; 122:4756-4767. [DOI: 10.1021/acs.jpca.8b02311] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rashid R. Valiev
- Department of Chemistry, University of Helsinki, P.O. Box 55, A.I. Virtanens plats 1, FIN-00014 Helsinki, Finland
- Department of Optics and Spectroscopy, Tomsk State University, 36, Lenin Avenue, 634050 Tomsk, Russian Federation
| | - Isaac Benkyi
- Department of Chemistry, University of Helsinki, P.O. Box 55, A.I. Virtanens plats 1, FIN-00014 Helsinki, Finland
| | - Yuri V. Konyshev
- Department of Optics and Spectroscopy, Tomsk State University, 36, Lenin Avenue, 634050 Tomsk, Russian Federation
| | - Heike Fliegl
- Hylleraas Centre for Quantum Molecular Sciences, Department of Chemistry, University of Oslo, P.O.
Box 1033, Blindern, 0315 Oslo, Norway
| | - Dage Sundholm
- Department of Chemistry, University of Helsinki, P.O. Box 55, A.I. Virtanens plats 1, FIN-00014 Helsinki, Finland
- Centre for Advanced Study at the Norwegian Academy of Science and Letters, Drammensveien 78, N-0271 Oslo, Norway
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15
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Wirz LN, Dimitrova M, Fliegl H, Sundholm D. Magnetically Induced Ring-Current Strengths in Möbius Twisted Annulenes. J Phys Chem Lett 2018. [PMID: 29532659 PMCID: PMC6150718 DOI: 10.1021/acs.jpclett.8b00440] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
The topology of twisted molecular rings is characterized by the linking number, which is equal to the sum of the twist-a local property of the molecular frame-and the writhe-a global parameter, which represents the bending of the molecular ring. In this work, we investigate a number of cyclic all- trans C40H40 annulenes with varying twisting numbers for a given linking number and their dications. The aromatic character is assessed by calculating ring-current strength susceptibilities using the gauge-including magnetically induced currents (GIMIC) method, which makes it possible to conduct a systematic study of the relation between the topology and aromaticity of twisted molecules. We found that the aromatic properties of the investigated Möbius twisted molecules are not only dependent on the linking number as previously suggested but also depend strongly on the partitioning of the linking number into the twist and writhe contributions.
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Affiliation(s)
- Lukas N Wirz
- Department of Chemistry , University of Helsinki , P.O. Box 55, A. I. Virtasen aukio 1 , FIN-00014 Helsinki , Finland
| | - Maria Dimitrova
- Department of Chemistry , University of Helsinki , P.O. Box 55, A. I. Virtasen aukio 1 , FIN-00014 Helsinki , Finland
- Hylleraas Centre for Quantum Molecular Sciences, Department of Chemistry , University of Oslo , P.O. Box 1033 Blindern, N-0315 Oslo , Norway
| | - Heike Fliegl
- Centre for Advanced Study at the Norwegian Academy of Science and Letters , Drammensveien 78 , N-0271 Oslo , Norway
| | - Dage Sundholm
- Department of Chemistry , University of Helsinki , P.O. Box 55, A. I. Virtasen aukio 1 , FIN-00014 Helsinki , Finland
- Hylleraas Centre for Quantum Molecular Sciences, Department of Chemistry , University of Oslo , P.O. Box 1033 Blindern, N-0315 Oslo , Norway
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